Heat sink

Abstract

A heat sink includes a first plate having a first surface with a heat source contact region, and a second surface has a looped peripheral groove, and first to n th evaporation/condensation grooved sections arranged sequentially within the looped peripheral groove. Each grooved section has parallel grooves. The first grooved section is disposed in an area corresponding to the contact region, and each groove therein has a leading end connected to the looped peripheral groove. Every two grooves in each of the second to n th grooved sections have leading ends connected to a trailing end of one groove in the preceding grooved section. The grooves in the n th grooved section having trailing ends connected to the looped peripheral groove.

1 . A heat sink comprising:
 a first plate including a first surface that has a contact region adapted to contact a heat source, and a second surface opposite to said first surface and having an area corresponding to said contact region, said second surface including a looped peripheral groove that extends along a periphery of said first plate, and first to n th  evaporation/condensation grooved sections that are arranged sequentially from said area of said second surface to another area away from said area, each of said first to n th  evaporation/condensation grooved sections having m number of substantially parallel grooves extending in a direction from said area to said another area of said second surface, each of said grooves of said first evaporation/condensation grooved section being disposed in said area and having a leading end connected fluidly to said looped peripheral groove, the number of said grooves in each succeeding one of said second to n th  evaporation/condensation grooved sections being twice the number of said grooves in a preceding one of said second to n th  evaporation/condensation grooved sections, every two of said grooves in each succeeding one of said second to n th  evaporation/condensation grooved sections having leading ends connected to a trailing end of one of said grooves in the preceding one of said second to n th  evaporation/condensation grooved sections, said grooves in said n th  evaporation/condensation grooved section having trailing ends connected fluidly to said looped peripheral groove; and   a second plate bonded sealedly to said second surface of said first plate to close said grooves in said first to n th  evaporation/condensation grooved sections and said looped peripheral groove.   
     
     
         2 . The heat sink of  claim 1 , wherein said second plate has a surface opposite to said first plate and formed with a plurality of fins. 
     
     
         3 . The heat sink of  claim 2 , wherein each of said fins has a root proximate to said surface of said second plate, and an end portion distal from said root, said root being larger in thickness than said end portion. 
     
     
         4 . The heat sink of  claim 1 , further comprising at least one heat conducting member inserted into said looped peripheral groove. 
     
     
         5 . A heat sink comprising:
 a coolant housing adapted to contact a heat source and having a receiving space to contain a coolant;   a first fin unit disposed in said receiving space and having a hollow central body and a plurality of fins projecting radially from said hollow central body;   a heat conducting member having one end portion inserted axially into said hollow central body and another end portion extending out of said coolant housing; and   a second fin unit having a hollow central body disposed around said another end portion of said heat conducting member, and a plurality of fins projecting radially from said hollow central body of said second fin unit.   
     
     
         6 . The heat sink of  claim 5 , wherein each of said fins of at least one of said first and second fin units has a root proximate to said hollow central body of the respective one of said first and second fin units, and an end portion distal from said root, said root being larger in thickness than said end portion.